Main problem for me with all worlds above is too hero-oriented world. You know everything about Middle Earth, Harry Potter or Dracula. So it will be either recreation of novel with artificially placed puzzles, or "fanfic" that I never fond of.
Well, obviously, two worlds are not so inclined to familiar heroes - Star Wars and Dark Tower. First is very detailed, so you can make any plot in it, and second have holes - well, whole canyons! - about everything, including main plot, and is multiverse actually that makes it even more open.
I voted for Dark Tower, as I seen many adventures in SW world, but nothing for King.